WO2018142554A1

WO2018142554A1 - Tip and dental syringe provided with same

Info

Publication number: WO2018142554A1
Application number: PCT/JP2017/003871
Authority: WO
Inventors: 英利也鈴木
Original assignee: 株式会社ベテル
Priority date: 2017-02-02
Filing date: 2017-02-02
Publication date: 2018-08-09

Abstract

This tip (40) used for a syringe (10) includes: a base portion(41) to be attached to the syringe (10); a tapered portion (42) that extends distally from the base portion (41); and a nozzle (43) that extends distally beyond the tapered portion (42) and has, at a distal end, an ejection port (431) for ejecting a liquid (L), wherein the nozzle (43) is made of plastic and has a thinness and a length such that the distal end is capable of reaching a root apex (t4). According to the present invention, the tip and dental syringe provided with the same can ensure that a liquid is distributed from the root apex to the pulp cavity and can be easily manipulated in the oral cavity.

Description

Tip and dental syringe provided with the tip

The present invention relates to a tip and a dental syringe provided with the tip.

Conventionally, syringes (injectors) have been used in various medical fields. The same is true in dentistry. In dental treatment, not only the needle (needle) penetrates into the oral cavity, but also a liquid agent such as a chemical solution is sprayed from the outer surface into the treatment target tooth, for example, the root canal of the trace of the pulp extracted It is also used in the case of injecting a liquid agent. As such a dental syringe, for example, a technique as disclosed in Patent Document 1 is disclosed.

Patent Document 1 has a nozzle mounting portion at the tip of a liquid agent storage portion, and the mounting portion is provided in a cylindrical insertion portion to be inserted into a base mounting hole of a nozzle member, an outer peripheral side of the insertion portion, and an inner surface. In the viscous liquid injection syringe in which the engagement piece provided at the base end portion of the nozzle member is screwed into the screw, the insertion portion is moved from the axially intermediate portion to the distal end side. The inner diameter is gradually reduced to a small diameter, and the distal end of the insertion portion is brought into contact with the top surface of the mounting hole of the nozzle member, so that the distal end opening of the insertion portion becomes a small hole that opens on the top surface of the nozzle member. It is disclosed that the liquid agent discharge path that connects directly and thereby reaches the small hole gradually becomes smaller in diameter toward the distal end side.

Here, in Patent Document 1, a nozzle member (here, for each element, a patient side is referred to as a distal side and a surgeon side is referred to as a proximal side as viewed from the surgeon) in the patent document 1. (Also referred to as a tip) is provided with an injection port for injecting the liquid medicine into the affected area on the end surface of the distal end of the capillary tube. Such a structure is not limited to Patent Document 1 and is widely known.

However, such a nozzle member reliably spreads the liquid from the root apex to the pulp cavity when treating the pulp cavity that is an elongated and bent shape in the narrow space in the oral cavity. In addition, the ease of handling in the oral cavity is not considered.

JP 2007-6994 A

Therefore, an object of the present invention is to provide a tip that can reliably spread the liquid agent from the apex to the pulp cavity and that can be easily handled in the oral cavity, and a dental syringe including the tip.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) The tip of the present invention is a tip used for a syringe, a base portion attached to the syringe, a tapered portion extending from the base portion to the distal side, and extending further distally from the tapered portion. And a nozzle portion having an injection port for injecting a liquid agent at the distal end portion, and the nozzle portion is made of plastic and has a thinness and a length that allows the distal end portion to reach the root apex. .
(2) In the configuration of (1), the nozzle portion has a spiral groove on a side surface.
(3) In the configuration of (2), there are a plurality of spiral grooves.
(4) In the configuration of (2) or (3), the distal end portion has a slit that allows the liquid agent ejected from the ejection port to communicate with the spiral groove.
(5) In any one of the constitutions (1) to (4), the tapered portion has a bellows-like bent portion.
(6) In any one of the constitutions (1) to (5), the nozzle portion has an outer diameter of 0.25 ± 0.05 mm and an inner diameter of 0.1 ± 0.05 mm at the distal end portion. Have
(7) In any one of the constitutions (1) to (6), the nozzle portion is made of plastic, and is viscoelastic that can maintain a bent state at least from the time it is bent to the time after surgery. Have
(8) The syringe of the present invention is a dental syringe provided with the tip of any one of (1) to (7) above, and a barrel in which the liquid agent is stored, and the inside of the barrel from the proximal side A plunger that is inserted and pushes the solution to the distal side and attached to the distal end of the barrel, and sprays the solution to the outside.

According to the present invention, it is possible to provide a tip that can be surely distributed from the apex to the pulp cavity, easy to handle in the oral cavity, and a dental syringe provided with the tip.

It is a figure which shows a mode that the dental treatment is performed using the chip | tip and syringe which concern on 1st Embodiment of this invention. (A) is an assembly perspective view of the syringe which concerns on 1st Embodiment of this invention, (b) is a perspective view of various chips | tips. It is sectional drawing which expands and shows the chip | tip attachment part of the syringe which concerns on 1st Embodiment of this invention. It is a figure which shows the position of the parting line (PL) of the chip | tip concerning 1st Embodiment of this invention, Comprising: (a) is a front view of a longitudinal direction, (b) is a left view (distal side), ( c) is a right side view (proximal side). FIG. 5A is a plan view of the chip viewed from the direction AA in FIG. 4A, and FIG. 5B is an enlarged view of a range B of the distal end portion of FIG. It is A arrow sectional drawing in Fig.4 (a). It is explanatory drawing which shows the flow of the liquid agent in the chip | tip which concerns on 1st Embodiment of this invention. It is an enlarged view of the distal end part in the nozzle part which concerns on 2nd Embodiment of this invention. It is a perspective view of the chip concerning a 3rd embodiment of the present invention. (A) is a top view of the chip | tip which concerns on 3rd Embodiment of this invention, (b) is a front view of the chip | tip concerning 3rd Embodiment of this invention, (c) is C arrow of (a). It is a view sectional view, (d) is the D section detailed drawing of (a), (e) is the E section detailed drawing of (c).

(First embodiment)
Hereinafter, a first mode for carrying out the present invention (hereinafter referred to as “first embodiment”) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

<Overall configuration of syringe 10>
First, with reference to FIG. 1, an example of a usage mode of the dental syringe 10 to which the tip 40 in the first embodiment is applied will be briefly described.
FIG. 1 shows a tip 40 attached to the distal side of a syringe 10 in a dental pulp cavity t3 from which enamel t1 and dentin t2 which are parts of a caries t are removed and the pulp is extracted in the treatment of caries t. The state where is inserted is shown.
As will be described later, the tip 40 used in the syringe 10 according to the first embodiment is extremely thin and made of a flexible plastic, so that the distal end can reach the apex t4. Have Therefore, unlike the conventional case, it can be reduced that the distal end of the nozzle portion does not reach the apex t4 due to the distal end of the nozzle being caught on the side surface of the pulp cavity t3, and the distal end of the tip 40 can be reduced. The apex t4 can be reached and followed along the fineness, length and shape of the pulp cavity t3.
The tip 40 includes a base portion 41 attached to the syringe 10, a tapered portion 42 extending distally from the base portion 41, and a nozzle portion 43 extending further distally from the tapered portion 42.
The nozzle portion 43 has an injection port 431 for injecting the liquid L at the distal end portion, and has a spiral groove 432 on the side surface. In the first embodiment, the nozzle portion 43 has one spiral groove 432, but may have two or more, for example, a double spiral.
Therefore, the liquid L such as a chemical solution and an adhesive stored in the syringe 10 is sprayed toward the root apex t4 and travels along the spiral groove 432 provided on the side surface of the nozzle portion 43 to approach the nozzle portion 43. Since it flows toward the distal side, it spreads evenly over a wide area of the side surface of the pulp cavity t3 that becomes the affected part.
In addition, the nozzle portion 43 is bent flexibly because the secondary moment is smaller than the nozzle portion 43 having a circular cross section where the spiral groove 432 is not provided because the spiral groove 432 is provided. Therefore, it is easy to handle in a narrow space in the oral cavity, and it is easy to treat the pulp cavity t3 which is an elongated and bent shape affected part.

FIG. 2A is an assembled perspective view of the syringe 10. FIG. 2B is a perspective view of various chips 40.
As shown in FIG. 2A, the syringe 10 includes a barrel 20 that stores the liquid L, a plunger 30 that is inserted into the barrel 20 from the proximal side and pushes the liquid L to the distal side, and the barrel 20. And a tip 40 for injecting the liquid L to the outside. In FIG. 2A, the tip 40 having the linear nozzle portion 43 is attached to the syringe 10, but as shown in FIG. 2B, the tip 40 has a length of the nozzle portion 43. Normal (first figure from the left), long nozzle part 43 (second figure from the left), nozzle part 43 is straight (first and second figures from the left), bent It is formed in various shapes such as a shape (third and fifth figures from the left) and a curved shape (fourth figure from the left), and an appropriate one can be selected according to the application. As shown in the rightmost diagram of FIG. 2B, the base 41 may be tapered.

The barrel 20 is a cylindrical storage container that stores the liquid L. The liquid L may be stored when the syringe 10 is used, or may be stored in advance when the syringe 10 is shipped (prefilled syringe). A finger grip 22 serving as a fulcrum when the plunger 30 is pushed in is provided on the proximal side of the barrel 20. Although not shown here, a scale indicating the amount of the liquid agent L is provided on the outer periphery of the barrel 20.

As the liquid L stored in the barrel 20, various types are applied, and in addition to the disinfectant, a dental filling material, preferably a photopolymerization type flow filling material can be used. These liquid agents L have different viscosities, and as will be described later, the viscosities are reflected in the setting of the outer diameter and inner diameter of the nozzle portion 43 in the tip 40.

At the distal side of the barrel 20, a chip mounting portion 21 for mounting a chip 40 to be described later is provided. FIG. 3 is an enlarged view of the tip mounting portion 21, and here, as the tip mounting portion 21, a Luer lock type is shown in order to ensure the prevention of the tip 40 from falling off. As shown in FIG. 3, the chip mounting portion 21 includes a cylindrical connection portion 211 having a female-side double threaded screw 212 formed on the inner peripheral surface, and a cylindrical shape provided on the inner peripheral surface side of the connection portion 211. And an insertion portion 213. The outer shape of the barrel 20 may be such that the distal side having the tip mounting portion 21 has a reduced diameter as shown in FIG. 3 or an enlarged diameter as shown in FIG. As shown).

The connection portion 211 and the insertion portion 213 are concentric, and a space for inserting a base portion 41 of the chip 40 described later is formed between the inner peripheral surface of the connection portion 211 and the outer peripheral surface of the insertion portion 213. Has been. A male double thread 413 provided on the outer peripheral surface of the threaded portion 412 of the base 41 of the chip 40 is screwed into the female double thread 212 of the connecting portion 211, and the insertion portion 213 is connected to the chip 40. It is inserted into the mounting hole 411 of the base 41. The insertion portion 213 is formed so that the outer diameter is substantially equal to the inner diameter of the mounting hole 411 of the tip 40, and the inner diameter and the outer diameter are gradually narrowed from the proximal side to the distal side.

Although the luer lock type is shown here, the application of the chip 40 according to the first embodiment is not limited to the luer lock type, and for example, a lure having only an insertion portion 213 for inserting the chip 40. It may be of corn type.

2 (a), the plunger 30 is a pusher that is inserted into the barrel 20 from the proximal end and pushes out the liquid L stored in the barrel 20. A gasket 31 for extruding the liquid agent L in a liquid-tight state is provided on the distal side of the plunger 30. The gasket 31 need not be limited to a specific embodiment, but here, the gasket 31 is formed integrally with the plunger 30. The gasket 31 is in contact with the inner wall of the barrel 20 with

double flanges

311 and 312, and maintains the liquid-tight state of the liquid L. Furthermore, the gasket 31 is provided with a protrusion 313 to be inserted into the chip 40 in order to reduce the amount of the liquid L remaining on the distal side. Of course, the gasket 31 may be formed separately from the plunger 30.

The tip 40 is for injecting the liquid L pushed out by the plunger 30, and is detachably attached to the tip attachment portion 21 of the barrel 20. The nozzle part 43 of the chip 40, which is the main part of the first embodiment, may be any of a linear shape, a bent shape, a curved shape, etc. I will explain it again.

<Chip 40>
First, the external appearance of the chip 40 will be described with reference to FIGS. 4 and 5. The chip 40 is preferably manufactured by a manufacturing method using a mold. For example, a pair of parisons (pipe-shaped resin materials) are extruded between a pair of molds, and the pair of molds are closed. After that, it can be manufactured by blow molding air into the desired hollow shape. When manufactured in this manner, the parting line PL is the part corresponding to the split surface of the pair of molds. In addition, the spiral groove 432 described later may be formed by a mold along with the manufacturing using the mold of the chip 40, and additional processing such as cutting is performed on the chip 40 released from the mold. It may be formed by applying.
FIG. 4A is a front view of the chip 40 in the longitudinal direction, and shows the position of the parting line PL. 4B shows a left side view (distal side) of FIG. 4A, and FIG. 4C shows a right side view (proximal side) thereof. FIG. 5A is a plan view seen from the AA direction of FIG. FIG.5 (b) is an enlarged view of the range B of the distal end part in Fig.5 (a).

As shown in FIGS. 4A and 5A, the chip 40 includes a base portion 41, a tapered portion 42, and a nozzle portion 43, which are integrally formed. The base portion 41 is a portion attached to the tip mounting portion 21 of the barrel 20, the taper portion 42 is a portion connecting the base portion 41 and the nozzle portion 43, and the nozzle portion 43 extends to the distal side of the taper portion 42 and is a liquid agent It is a part which distribute | circulates L to a desired location.

As described above, the base 41 is a luer lock type, and the proximal end thereof is a screwing portion 412. That is, a male-side double thread 413 is provided on the outer peripheral surface of the threaded portion 412, and is screwed with a female-side double thread 212 provided on the inner peripheral surface of the connection portion 211 of the chip mounting portion 21. .

On the outer peripheral surface of the taper portion 42 extending distally from the base portion 41, four finger hook portions 423 are evenly arranged around the axis of the base portion 41 so that the tip 40 can be easily screwed into the tip mounting portion 21. And are provided radially. Here, four finger hooks 423 of the same shape and size are shown. However, as shown in the fourth diagram from the left in FIG. 2B, the nozzle 43 is not linear but bent or curved. In the case of a shape, a part of the shape may be irregular. As a result, when the base 41 is attached to and detached from the tip attaching portion 21, the tip 40 can be easily gripped and rotated and handled even if the nozzle portion 43 is not linear. Moreover, even if the finger hook part 423 becomes a reinforcement rib with respect to the taper part 42, it contributes to a rigid improvement and the thickness of the taper part 42 is thin, it can be set as the structure which can bear the internal pressure by the liquid agent L, and a shape can be ensured.

The nozzle portion 43 extending from the base portion 41 via the taper portion 42 has an injection port 431 through which the liquid L is injected at the distal end portion, and has a spiral groove 432 on the side surface. The cross-sectional shape of the spiral groove 432 is not limited to a rectangular shape, and may be a triangular shape or a semicircular shape.
Since the nozzle portion 43 has the spiral groove 432 on the side surface, the bending rigidity can be reduced, and the nozzle portion 43 can be supple and can be kept bent so as to follow the shape of the pulp cavity t3. It is possible to avoid giving pain to the patient because the portion 43 does not pierce in the pulp cavity t3 or other oral cavity.

The cross-sectional area that becomes the flow path of the liquid agent L in the spiral groove 432 may be gradually decreased from the distal side to the proximal side in the nozzle portion 43. As a result, not only the liquid L is spread evenly over a wide area in the affected area, but also the affected area existing in a wide area from the distal side to the proximal side while relaxing the pressure due to the liquid L at the distal end. The pressure can be dispersed with respect to the range. Therefore, the pain given to the patient can be further alleviated.

The internal structure of the chip 40 will be described with reference to FIG.
FIG. 6 is a cross-sectional view taken along arrow A in FIG.
As shown in FIG. 6, the inside of the base portion 41 is a mounting hole 411, and the insertion portion 213 of the chip attachment portion 21 is inserted. The mounting hole 411 is formed so that the inner diameter gradually narrows from the proximal side to the distal side so as to be compatible with the insertion portion 213.

The taper portion 42 communicates the base portion 41 and the nozzle portion 43, and in order to increase the internal pressure of the chemical liquid pushed out from the insertion portion 213 of the barrel 20 by the plunger 30, the proximal end thereof has an inner diameter of the base portion 41. An inlet 421 having a continuous diameter is provided. In addition, an outlet 422 communicating with the nozzle portion 43 is provided on the distal side, and the inner diameter is formed so as to be sharply narrowed from the inlet 421 toward the outlet 422.

The nozzle portion 43 is a thin tube extending to the distal side of the tapered portion 42, and its proximal end communicates with the outlet 422 of the tapered portion 42. The distal side of the nozzle part 43 is thinner than the proximal side. The length, thinness, and material of the nozzle portion 43 are set so that it can cope with cleaning of the pulp cavity t3, filling of the adhesive, and the like in the dental treatment as shown in FIG. It is preferable to make the nozzle portion 43 thinner within the scope of restrictions such as a manufacturing method using a mold.

When used for dental treatment, at least the nozzle portion 43 of the tip 40 is used in a state bent by a doctor so as to follow the shape of the pulp cavity t3, so that at least the time from the bending to the postoperative period (for example, (3 minutes), it is preferable to use a viscoelastic plastic that can maintain a bent state. Further, from the viewpoint of good flexibility, it is particularly preferable to mold with polypropylene (PP). The nozzle portion 43 may be plastically deformed so that it can be bent after being bent.
As a result, the nozzle portion 43 becomes supple and can be kept bent so as to follow the shape of the pulp cavity t3. Therefore, during the operation, the nozzle portion 43 is stuck in the pulp cavity t3 and other oral cavity. Without hurting the patient.

Next, an example of the dimensions of the chip 40 will be described. Among the dimensions, the length can be set as appropriate according to the application. For example, when the total length is 35 mm, the length of the base 41 is 8 mm, the length of the taper 42 is 6 mm, and the nozzle 43. Can be set to 21 mm or the like. At that time, it is desirable to make the nozzle part 43 as thin as possible within the limits of the manufacturing method using a mold or the like. For example, the outer diameter of the distal end part of the nozzle part 43 is 0.25 mm. The inner diameter can be in the range of 0.1 mm to 0.4 mm. In setting the outer diameter and the inner diameter, the viscosity of the liquid L can be taken into consideration.

In the liquid L having a viscosity of 1.0 to 5.0 mPa · s, the thinnest outer diameter and inner diameter of 0.25 mm and 0.1 mm can be employed. The dimensional tolerance is expected to be ± 0.05 mm with respect to the reference dimension. Therefore, the nozzle portion 43 has an outer diameter of 0.25 ± 0.05 mm and an inner diameter of 0.1 ± 0.05 mm at its distal end. By adopting such a thin and long nozzle portion 43, the distal end portion of the nozzle portion 43 can reach the root apex t4.

Next, the flow of the liquid agent L will be described with reference to FIG.
FIG. 7 is an explanatory diagram showing the flow of the liquid L.
As shown in FIG. 7, the nozzle portion 43 of the chip 40 in the first embodiment has an injection port 431 for injecting the liquid L at the distal end portion, and has a spiral groove 432 on the side surface. Therefore, the liquid L pushed out by the plunger 30 is ejected in the axial direction (arrow L1 in FIG. 7) from the ejection port 431 toward the root apex t4 (see FIG. 1). A part of the jetted liquid L flows in the direction of the proximal side (upward in FIG. 7) as indicated by the arrow L2 along the surface of the distal end 43a of the nozzle portion 43. Then, the liquid L reaches the spiral groove 432 provided on the side surface of the nozzle portion 43, partly flows sideways as indicated by the arrow L3, and partly passes through the spiral groove 432 as indicated by the arrow L4. It flows to the proximal side. Similarly, part of the liquid L that has reached the spiral groove 432 flows sideways as indicated by arrows L5, L7, and L9, and passes through the spiral groove 432 as indicated by arrows L6 and L8. It flows to the proximal side.
In this way, the liquid L is ejected toward the apex t4 and flows toward the proximal side of the nozzle portion 43 through the spiral groove 432 provided on the side surface of the nozzle portion 43. It spreads evenly over a wide area on the side of t3 (not shown).

(Second Embodiment)
Next, a second mode for carrying out the present invention (hereinafter referred to as “second embodiment”) will be described with reference to FIG.
Since the nozzle part 43 in the second embodiment has a different distal end structure compared to the nozzle part 43 in the first embodiment, the structure of the distal end part in the nozzle part 43 will be particularly described below. .
FIG. 8 is an enlarged view of the distal end portion of the nozzle portion 43 according to the second embodiment of the present invention.
As shown in FIG. 8, the distal end portion of the nozzle portion 43 has a slit 433 that allows the liquid L ejected from the ejection port 431 to communicate with the spiral groove 432.

The slit 433 is provided at the distal end 43a of the nozzle portion 43 so as to extend in the diameter direction of the distal end portion. An injection port 431 is opened on the bottom surface of the slit 433. Thereby, since the liquid L injected from the injection port 431 also flows in the diameter direction (arrow R2) in addition to the axial direction (arrow R1), the pressure of the injection in the axial direction can be reduced. Moreover, since the liquid agent L that has flowed in the diameter direction flows through the slit 433 and flows into the spiral groove 432 as indicated by an arrow R2 in FIG. 8, it travels along the spiral groove 432 toward the proximal side of the nozzle portion 43. It can flow easily and can be spread evenly over a wide area of the side surface of the pulp cavity t3.

In addition, in FIG. 8, although the distal end 43a is shown by the plane, it is not restricted to this, A part of spherical surface and a part of curved surface may be sufficient. When the nozzle portion 43 is viewed from the distal side to the proximal side, the portion of the distal end 43a that overlaps with the injection port 431 (the opening on the distal side of the slit 433) is closed, and the distal end 43a is uneven, for example. It may be a flat surface, a spherical surface, or a curved surface. Thereby, since the liquid agent L injected from the injection port 431 collides with the occluded portion, the liquid agent L can be reduced without causing the liquid agent L to be directly injected onto the apex t4, and the pain given to the patient can be reduced. Flows through the slit 433 to the spiral groove 432, so that the liquid L can be spread evenly over a wide area of the side surface of the pulp cavity t3.

(Third embodiment)
Hereinafter, a third mode for carrying out the present invention (hereinafter referred to as “third embodiment”) will be described with reference to FIGS. 9 and 10.
Since the chip 40 in the third embodiment is different in the structure of the taper portion 42 from the chip 40 in the first embodiment and the second embodiment, the structure of the taper portion 42 will be particularly described below. In the following, the case where the spiral groove 432 is not provided on the side surface of the nozzle portion 43 will be described. However, the chip 40 in the third embodiment may have the spiral groove 432 on the side surface of the nozzle portion 43.
FIG. 9 is a perspective view of a chip 40 according to the third embodiment of the present invention.
FIG. 10A is a plan view of a chip 40 according to the third embodiment of the present invention. FIG. 10B is a front view of the chip 40 according to the third embodiment of the present invention. FIG. 10C is a cross-sectional view taken along the arrow C in FIG. FIG. 10 (d) is a detailed view of a portion D in FIG. 10 (a). FIG. 10 (e) is a detailed view of a portion E in FIG. 10 (c).

As shown in FIGS. 9 and 10, the tip 40 includes a base portion 41 attached to the syringe 10, a tapered portion 42 extending distally from the base portion 41 and having a bellows-like bent portion J, and a tapered portion 42. And a nozzle portion 43 extending further to the distal side. The nozzle part 43 has the injection port 431 which injects the liquid agent L in a distal end part.

The bent portion J has a substantially uniform thickness T over the axial direction of the tapered portion 42. In order to ensure the flexibility (flexibility) of the tapered portion 42, the thickness T of the tapered portion 42 is smaller than the thickness of the nozzle portion 43 and the thickness of the base portion 41.

The bent portion J is formed such that a plurality of apexes having a maximum diameter Dmax having substantially the same diameter and a plurality of skirt portions having a minimum diameter Dmin having substantially the same diameter are alternately arranged. The bent portion J has four circumferential grooves each having a top portion on both sides and a skirt portion therebetween. In each circumferential groove, the interval p1 between the skirt and the distal apex adjacent to the skirt is greater than the interval p2 between the skirt and the proximal apex adjacent to the skirt. Yes.

Since the bent portion J has a bellows shape, the tip 40 is bent at a desired angle within a predetermined angle range of, for example, 0 ° to 90 ° at the tapered portion 42 between the base portion 41 and the nozzle portion 43. Can be held in shape. At the same time, since the bent portion J has a bellows shape, rigidity with respect to the force from the radial direction of the tip 40 is ensured, so that it is difficult to be crushed in the radial direction.
Therefore, depending on the location of the affected area, the tip 40 can be bent by bending it to a desired angle, and it is easy to handle in a narrow space in the oral cavity, and the pulp cavity t3 is treated as an elongated and bent shape affected area. In addition, it is not necessary to select from chips 40 having various bent shapes.

Although the embodiments have been described above, the present invention is not limited to the specific embodiments, and includes various modifications, which are claimed by those skilled in the art. It is clear from the description. For example, the nozzle portion 43 of the chip 40 may be bent or curved in addition to a linear shape.

According to the present invention, the tip 40 used in the syringe 10 includes a base portion 41 attached to the syringe 10, a tapered portion 42 extending distally from the base portion 41, and further extending further distally from the tapered portion 42. And a nozzle portion 43 having an injection port 431 for injecting the liquid L at the distal end portion. The nozzle portion 43 is made of plastic, and the distal end portion is thin enough to reach the apex t4. Since the distal end of the nozzle part does not reach the apex t4 by being hooked on the side surface of the pulp cavity t3 as in the prior art, the distal end of the tip 40 can be reduced. The distal end can reach the apex t4 and can follow along the fineness, length and shape of the pulp cavity t3. Therefore, the liquid agent L can be reliably spread from the apex t4 to the pulp cavity t3, and is easily handled in the oral cavity.

According to the present invention, the nozzle portion 43 has the spiral groove 432 on the side surface. Therefore, the cross-sectional secondary moment of the nozzle portion 43 is reduced, the nozzle portion 43 can be flexibly bent, and it is prevented from being pierced inside the dental pulp cavity t3 or other oral cavity and avoiding pain to the patient. it can. In addition, since the nozzle portion 43 can be flexibly bent, it is easy to handle in the narrow space in the oral cavity, and it is easy to treat the pulp cavity t3 which is an elongated and bent shape affected part. Furthermore, the liquid agent L can be spread evenly over a wide range of the side surface of the pulp cavity t3 as the affected part.

According to the present invention, the tapered portion 42 has a bellows-like bent portion J. Therefore, the tip 40 can be held in a shape bent at a desired angle within a predetermined angle range of 0 ° to 90 °, for example, at the tapered portion 42 between the base portion 41 and the nozzle portion 43. Therefore, depending on the location of the affected area, the tip 40 can be bent by bending it to a desired angle, and it is easy to handle in a narrow space in the oral cavity, and the pulp cavity t3 is treated as an elongated and bent shape affected area. In addition, it is not necessary to select from chips 40 having various bent shapes.

According to the present invention, the tapered portion 42 has a bellows-like bent portion J, and the nozzle portion 43 has a spiral groove 432 on the side surface. Therefore, depending on the location of the affected area, the tip 40 can be bent by bending it to a desired angle, and it is easy to handle in a narrow space in the oral cavity, and the pulp cavity t3 is treated as an elongated and bent shape affected area. In addition, it is not necessary to select from chips 40 having various bent shapes. In addition, it is easy to treat the pulp cavity t3, which is an affected part having an elongated and bent shape. Furthermore, the liquid agent L can be spread evenly over a wide range of the side surface of the pulp cavity t3 as the affected part.

According to the present invention, since there are a plurality of spiral grooves 432, the liquid L can be spread evenly around the nozzle portion 43, that is, over the entire inner surface of the pulp cavity t3. Further, the pressure of the liquid L can be dispersed in the longitudinal direction and the circumferential direction on the inner surface of the pulp cavity t3.

According to the present invention, since the distal end portion has the slit 433 that communicates the liquid L ejected from the ejection port 431 to the spiral groove 432, a part of the liquid L ejected from the ejection port 431 is diametrically aligned. It is possible to escape, and the pressure of the injection in the axial direction can be reduced. In addition, the liquid agent L that has flowed in the diametric direction can easily flow toward the proximal side of the nozzle portion 43 through the spiral groove 432, and can be spread evenly over a wide range of the side surface of the dental pulp cavity t3.

According to the present invention, the nozzle portion 43 has an outer diameter of 0.25 ± 0.05 mm and an inner diameter of 0.1 ± 0.05 mm at the distal end portion. The sectional moment at the distal end is reduced, the distal end can be flexed flexibly, damage to the pulp cavity t3 and other oral cavity can be reduced, and pain to the patient can be avoided.

According to the present invention, the nozzle portion 43 is made of plastic and has viscoelasticity that can maintain a bent state at least from the time it is bent to after the operation, so that the nozzle portion 43 is supple. In addition, since the bent state is maintained so as to follow the shape of the dental pulp cavity t3, it is possible to avoid piercing the dental pulp cavity t3 and other inside of the oral cavity during the operation, and avoid giving pain to the patient. .

10 ... Syringe 20 ... Barrel 21 ... Chip mounting part (for barrel 20)
211 ... Connection part 212 ... Female side double thread 213 ... Insertion part 22 ... Finger grip 30 ... Plunger 31 ... Gasket (of the plunger 30)
311, 312 ... flange 313 ... projection 40 ... tip 41 ... base (of tip 40)
411 ... Mounting hole 412 ... Screw portion 413 ... Double thread 42 on the male side ... Taper portion (of the tip 40)
421 ... Inlet 422 ... Outlet 423 ... Fingering part 43 ... Nozzle part (in the tip 40)
43a ... Distal end (of nozzle part 43)
431 ... injection port 432 ... spiral groove 433 ... slit t ... caries t1 ... enamel t2 ... dentin t3 ... pulp cavity t4 ... root apex L ... liquid agent J ... bent part PL ... parting line Dmax ... maximum diameter Dmin ... minimum diameter T ... Thickness p1 ... interval p2 ... interval

Claims

A tip used for a syringe,
A base attached to the syringe;
A tapered portion extending distally from the base;
A nozzle part extending further distally from the taper part and having an injection port for injecting a liquid agent at the distal end part,
The nozzle part is made of plastic, and has a thin end and a length that allows the distal end part to reach the apex.
The chip according to claim 1, wherein the nozzle part has a spiral groove on a side surface.
The chip according to claim 2, wherein there are a plurality of spiral grooves.
4. The chip according to claim 2, wherein the distal end portion has a slit that allows the liquid agent ejected from the ejection port to communicate with the spiral groove. 5.
The chip according to claim 1, wherein the tapered portion has a bellows-like bent portion.
6. The nozzle according to claim 1, wherein the nozzle has an outer diameter of 0.25 ± 0.05 mm and an inner diameter of 0.1 ± 0.05 mm at the distal end. The chip according to item.
The tip according to any one of claims 1 to 6, wherein the nozzle portion has viscoelasticity capable of maintaining a bent state at least from a time after being bent to a time after surgery. .
A dental syringe,
A barrel in which the liquid agent is stored;
A plunger that is inserted into the barrel from the proximal side and pushes the solution to the distal side;
The tip of any one of Claims 1-7 attached to the distal end of the said barrel, and spraying the said liquid agent outside, The syringe characterized by the above-mentioned.